The four-hour glycemic response includes: four-hour post-meal area under the median interstitial glucose curve, post-meal interstitial glucose peak, time to peak, time to return to pre-prandial level (to within 10% of baseline with a maximum of the 4-hour post-meal fast), difference between peak and baseline, average rate of change in interstitial glucose across the 4 hour post-meal period, and percent of the 4-hour post-meal glucose readings >180 mg/dL.